A new policy formulated, .
A. thus did the economic reform begin
B. thus began the economic reform
C. thus had the new economic reform began
D. began the economic reform thus
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(答案→)A. thus did the economic reform begin
B. thus began the economic reform
C. thus had the new economic reform began
D. began the economic reform thus
解析：考查倒装结构。用以 there, here, where, now, then, thus 等副词开头的以名词为主语的句子，主语是代词时不倒装。句意：新制定的政策，这样经济改革开始了。